Recently, I saw a lot of blog post, forum posts etc on Fuel Dumping. For me it seemed like you can book a flight with high fuel charges, and then add another unrelated leg to the flight that you not plan to use to get rid of the high fuel charges. However, I could not find any concrete explanation on how fuel dumping works.

It basically seems to consist of finding weird combinations of trips in the arcane intricacies of the airlines' fare construction where the system messed up; from the airlines' point of view that's an error they'll fix if they learn about it, so nobody who wants to exploit these errors will publish concrete examples on the internet.
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Michael BorgwardtJun 10 '13 at 9:42

The link in my recent question explains it nicely, in my opinion. Still, I think a good explanation should be available right on Travel Answers - so have my upvote!
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fekleeJun 10 '13 at 17:53

@jwenting it's a fairly common topic on flyertalk, from what I've seen around too. However, I'll try and find some links to make a proper answer when I get a sec.
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Mark MayoJun 12 '13 at 10:53

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@jwenting: It does not have any resemblance to a conspiracy theory, for one thing the results are very demonstrable. The point seems to be that the fuel surcharge for the longer flight is replaced by that for the shorter one in some cases.
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Michael BorgwardtJun 13 '13 at 8:39

1 Answer
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Fuel dumping is a method by which a fuel surcharge on an international
fare is removed through the addition of one or more additional
unrelated segments. Because of IATA (International Air Transport
Association) rules that few people understand completely, the
combination of certain flights and carriers causes the fuel surcharge
to be all or partially eliminated. Although you still have to pay for
the additional segment (called a “3X” or “third strike” because it is
the third flight and you “strike” it by not flying) the added cost of
a good 3X is much less than the savings of not paying for a fuel
surcharge of $300-500.

It's a hugely complex topic to figure out how to do. I've read a lot about it and it still confuses me. However, the best resource I've found is the three part series "An Introduction to Fuel Dumping".

It covers the basics, how to find candidate fares, finding and booking a fare with this method, and advanced strategies, and personally I've found it requires a lot of time, effort and re-reading to even make sense of the article, let alone try it out.